Thinking Cap
A special helmet that Zaphod Beeblebrox uses in the film adaptation. It is possibly an old-fashioned device, as stated by Ford Prefect that it was used when ship captains needed to concentrate. It is basically a helmet with a trigger device on top that resembles an automatic citrus juicer, which is why it is powered by common lemon juice. The effects of the thinking cap, in Zaphod's case, last about 10 minutes per lemon. In the film, Arthur Dent negatively remarks to Ford's trust Zaphod's ability at making guesses by angrily replying "Go with the hunch of a man whose brain is fuelled by LEMONS!?" After Ford starts the Thinking Cap, Zaphod (who was very groggy from having his second head removed by force) immediately was able to walk straight and think smarter than usual, and ten minutes later he could still walk, but was back to his normal, over-the-top self.
Read more about this topic: Technology In The Hitchhiker's Guide To The Galaxy, Personal Items
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